<template>
  <div>
    <el-button @click="add">新增</el-button>
    <el-button @click="save">保存</el-button>
    <el-form id="table-form" ref="form" :rules="rules" :model="form">
      <el-table ref="table" :data="form.tableData" border>
        <el-table-column>
          <template slot="header">
            <p>
              姓名
              <span style="color: red; font-size: 16px">*</span>
            </p>
          </template>
          <template slot-scope="scope">
            <el-form-item
              :prop="'tableData.' + scope.$index + '.name'"
              :rules="rules.name"
            >
              <el-input
                v-model="scope.row.name"
                @keyup.native.enter="nextFocus($event, scope.row)"
              ></el-input>
            </el-form-item>
          </template>
        </el-table-column>
        <el-table-column>
          <template slot="header">
            <p>
              年龄
              <span style="color: red; font-size: 16px">*</span>
            </p>
          </template>
          <template slot-scope="scope">
            <el-form-item
              :prop="'tableData.' + scope.$index + '.age'"
              :rules="rules.age"
            >
              <el-input
                v-model.number="scope.row.age"
                type="number"
                @keyup.native.enter="nextFocus($event, scope.row)"
              ></el-input>
            </el-form-item>
          </template>
        </el-table-column>
        <el-table-column label="身高">
          <template slot-scope="scope">
            <el-form-item>
              <el-input
                v-model.number="scope.row.height"
                type="number"
                @keyup.native.enter="nextFocus($event, scope.row)"
              ></el-input>
            </el-form-item>
          </template>
        </el-table-column>
        <el-table-column label="年龄+身高" prop="other" />
      </el-table>
    </el-form>
  </div>
</template>

<script>
export default {
  data() {
    return {
      inputDoms: "",
      tableIndex: 0,
      form: {
        tableData: [],
      },
      rules: {
        name: [{ required: true, message: "名字不能为空", trigger: "blur" }],
        age: [{ required: true, message: "年龄不能为空", trigger: "blur" }],
      },
    };
  },
  watch: {
    "form.tableData": {
      handler(val) {
        val.forEach((item) => {
          item.other = item.age + item.height;
        });
      },
      deep: true,
    },
  },
  created() {
    this.$nextTick(() => {
      this.initInputDOM();
    });
  },
  methods: {
    initInputDOM() {
      //获取id为table-form下的所有input 框
      const inputDoms = document.querySelectorAll(
        "#table-form .el-input__inner"
      );
      //遍历这个input框给他们一个标识
      inputDoms.forEach((item, index) => {
        item.setAttribute("data-index", index);
      });
      this.inputDoms = inputDoms;
    },
    //回车事件
    nextFocus(event, row) {
      const index = event.target.getAttribute("data-index");
      const nextIndex = parseInt(index) + 1;
      const length = this.inputDoms.length;
      if (nextIndex < length) {
        this.inputDoms[nextIndex].focus();
      } else {
        this.inputDoms[0].focus();
      }
    },

    add() {
      this.form.tableData.push({
        name: "",
        age: "",
        height: "",
        other: "",
      });
      this.$nextTick(() => {
        this.initInputDOM();
      });
    },
    del(index) {
      this.form.tableData.splice(index, 1);
    },
    save() {
      this.$refs.form.validate((valid) => {
        if (valid) {
        }
      });
    },
  },
};
</script>
